Development of laser based tunnel scanner mounted on the guide bed

초록

Most railway structures require routine inspection and maintenance to extend the life cycle of the structures. Most cases the routine inspection plays a major role on the determination of maintenance time and method. Structures like tunnel undergo exterior and interior inspection regularly. The typical exterior inspection of tunnel liner is mainly conducted by human. Since the subjective and labor intensive processes continue for the inspection, more robust and automated inspection system is necessary. This study aims development of an automated tunnel inspection system based upon a 3 dimensional laser scanner. As for the initial stage of the project, a trial model of the tunnel scanner has been developed. The performance and applicability of the system has been evaluated from the scanning of railway and subway tunnels in operation. Even though the extent of scanning is quite short, the scanned results show that the model can be applicable for different shape and size of tunnels in use. The applicable size of tunnel will be limited by the range of laser sensor.